/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/EdGraphSchema_Niagara.h
Tries to get a default value string for a graph pin from a niagara variable.
Whether or not we could get a default value form the supplied variable.
bool TryGetPinDefaultValueFromNiagaraVariable ( const [FNiagaraVariable](API\Plugins\Niagara\FNiagaraVariable) & Variable, [FString](API\Runtime\Core\Containers\FString) & OutPinDefaultValue ) const